Articles | Volume 2, issue 1
https://doi.org/10.5194/mr-2-33-2021
https://doi.org/10.5194/mr-2-33-2021
Research article
 | 
17 Feb 2021
Research article |  | 17 Feb 2021

Room-temperature hyperpolarization of polycrystalline samples with optically polarized triplet electrons: pentacene or nitrogen-vacancy center in diamond?

Koichiro Miyanishi, Takuya F. Segawa, Kazuyuki Takeda, Izuru Ohki, Shinobu Onoda, Takeshi Ohshima, Hiroshi Abe, Hideaki Takashima, Shigeki Takeuchi, Alexander I. Shames, Kohki Morita, Yu Wang, Frederick T.-K. So, Daiki Terada, Ryuji Igarashi, Akinori Kagawa, Masahiro Kitagawa, Norikazu Mizuochi, Masahiro Shirakawa, and Makoto Negoro

Cited articles

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Ajoy, A., Nazaryan, R., Liu, K., Lv, X., Safvati, B., Wang, G., Druga, E., Reimer, J. A., Suter, D., Ramanathan, C., Meriles, C. A., and Pines, A.: Enhanced dynamic nuclear polarization via swept microwave frequency combs, P. Natl. Acad. Sci. USA, 115, 10576–10581, https://doi.org/10.1073/pnas.1807125115, 2018b. a
Ajoy, A., Safvati, B., Nazaryan, R., Oon, J. T., Han, B., Raghavan, P., Nirodi, R., Aguilar, A., Liu, K., Cai, X., Lv, X., Druga, E., Ramanathan, C., Reimer, J. A., Meriles, C. A., Suter, D., and Pines, A.: Hyperpolarized relaxometry based nuclear T1 noise spectroscopy in diamond, Nat. Commun., 10, 5160, https://doi.org/10.1038/s41467-019-13042-3, 2019. a
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Short summary
We show 13C spin hyperpolarization using laser irradiation at room temperature in two different systems: 1. pentacene doped in organic crystals of benzoic acid and 2. nitrogen-vacancy (NV) color centers in microdiamonds. The 13C NMR signal was enhanced by a factor of > 3000 using pentacene and > 300 using NV centers as polarization sources. We analyze the pros and cons of these two systems and discuss their prospects for room-temperature enhancement of NMR signals.